.box-drag {
    position: absolute;
    top   : 20px;
    border: 1px solid gray;
    width : 90px;
    height: 2ex;
    text-align: center;
    padding: 1ex;
}

.box-drop {
    position: absolute;
    top   : 100px;
    width : 100px;
    height: 2.2ex;
    text-align: center;
    padding: 1ex;
}
